He's potentially facing civil and criminal charges, both personally and as an officer of of MF Global, additional public testimony and repeated depositions. On top of that, each of those facets require more than minor PR efforts, which must be coordinated for even minimal efficacy. Having an office makes sense. Having the fact that you are looking for an office leaked to the press is less good.
In all likelihood, Corzine is simply looking for an office that isn't his lawyers' or PR flack's where he can do work for the many many months ahead. Couldn't he just work from their offices? Maybe. Or Maybe not. But can we begrudge the man his own Virginia Wolf moment?
So long as he pays for it personally, worse things have happened. Actually, Jon Corzine has done worse things and not just figuratively.
Let's continue to judge him on those things, not the fact that his ego still propels him to have a business mailing address and someone to answer his phone.